As ridesharing companies expand nationally — and internationally in the case of UberX — their pain points are different from other businesses and sectors. Drumming up consumer demand has proved simple. Perhaps too simple. So simple in fact, that ridesharing companies have in a sense become victims of their own success. They have too many passengers and not enough drivers.

“When we first started we had a passenger wait list,” Lyft co-founder John Zimmer tells me over the phone. “We’ve had such fast growth on the demand side that we constantly have to balance that side of the equation.”

Companies haven’t been afraid to admit this publicly. Uber’s CEO, Travis Kalanick, penned a lengthy letter to customers, saying “[W]e have to continue to get massive amounts of drivers on board as quickly as possible. Supply for experienced drivers in the city is dwindling.”

Both companies have introduced surge pricing — where the cost goes up during busy hours — to draw more drivers onto the roads because they can make more during popular hours, like Saturday nights. Lyft has plastered Facebook profiles with “come drive for Lyft” ads.

Uber has rolled out financing options, in which the company helps Uber drivers buy cars with low-interest rate loans. There’s also driver poaching. Yesterday Uber began offering Lyft drivers in SF a $50 gas card to swing by the office for an interview, with additional perks if they switched companies to start driving for Uber.

Any wantrepreneur’s ears should be perking up right about now. Where there’s a pain point, there’s a business opportunity.

Right on schedule, a startup has quietly launched in stealth to meet the driver demand need. ZephyrCar, a company that’s been flying under the radar for the last few months with little more than a simple website and a Craigslist ad, aims to get more ridesharing drivers onto the road. How? By renting to potential drivers who don’t own or aren’t able to lease vehicles.

Zephyr charges $50-$75 a day to ‘rent’ a car. Said renters have to go through Lyft or Uber’s application process, which involves background checks and interviews. Once approved, they sign up for car-renting schedules with ZephyrCar, pay the daily rental fee, and keep the profit they make from the ridesharing itself. ZephyrCar isn’t partnering with Lyft or Uber — it’s operating independently, stacking its business on top of theirs.

It’s the type of company the ecosystem sorely needs as ridesharing startups face scaling challenges. It’s also something that would be welcomed by car-less individuals looking to make money in urban areas.

ZephyrCar matches drivers with one insured vehicle so that their profiles through the app are always consistent. They are also listed on the insurance for that car. That works with Uber and Lyft’s app systems, which assure passengers they can feel safe by including the driver’s license plate number and a picture of his or her car in the app. [UPDATE: An earlier version of this story incorrectly stated that ZephyrCar drivers are not listed on the insurance of the cars they rent.]

In theory, a Zephyr driver doesn’t violate Uber or Lyft‘s terms of service on the user end. Both Uber and Lyft firmly declare they’re merely platforms with no liability, matching willing providers with willing passengers.

We’ve reached out to Uber and Lyft for comment about Zephyr, and will update this story if we hear back.

Zephyr is such a young company that its founder(s) likely haven’t figured out all the details yet. They’re still honing their logistics and testing what works best. They’re in that nascent startup stage, slowly wrapping itself into a cocoon, hoping not to fall out and die before ever getting the chance to grow.

When they do figure out the details though, ZephyrCar is onto something significant. Unlike some other startups (more calendar apps anyone?), this company is meeting a compelling need, one that benefits the ridesharing ecosystem as a whole as it aims to disrupt traditional transportation.

Facebook has introduced Scrapbook, a new feature that allows parents to share and collect images of their children in one place without requiring them to worry about tagging their kids’ face with each other’s names just to make sure they don’t miss what the other person has posted. [Source: Facebook]

“For all the clumsy rhetorical lip service [former Yahoo News head] Guy Vidra pays to The New Republic’s hallowed intellectual traditions, this is what his vision of a nimble digital news product finally translates into: a vaguely journalistic veneer strategically designed to conceal a rancid interior of ‘elevated’ advertising.”

Indian e-commerce company Flipkart is said to be raising $600 million in its latest bid to compete with Amazon. The company is also said to have garnered a higher valuation with this funding round — quite the feat, considering it was previously valued at around $11.5 billion. [Source: The Economic Times]

Here comes another unicorn: Sprinklr, a New York-based marketing company, has raised $46 million at a $1.17 billion valuation. The funds will be used to help the 700-person company expand its marketing platform. [Source: Fortune]

Curator, the tool Twitter created so the media could find and share tweets with its audience, is now available to the public. Because if there’s anything people wanted to see more of, it’s tweets randomly inserted into blog posts, television spots, and other forms of media. [Source: TechCrunch]

A court in France has decided not to ban Uber’s low-cost services until the country’s highest appeals court, or its supreme court, weigh in on the constitutionality of a new transport law. [Source: The Wall Street Journal]

Tinder is refocusing on its spam-fighting efforts in the wake of reports that movie studios are using the service to promote their movies, scammers are attempting to steal information via the app, and pranksters have created tools that trick heterosexual men into flirting with each other. [Source: The Verge]

Uber offers drivers whose accounts have been deactivated a choice: attend a class that requires them to pass an exam, or take a class that doesn’t. The latter has been informed by Uber employees, and the company has sent thousands of drivers to it, according to a report from BuzzFeed. Why is that a problem? Because Uber isn’t supposed to provide its drivers with formal training; doing so makes them bona fide employees, not independent contractors. [Source: BuzzFeed]

Flipboard users will now be able to collect articles and share them via private magazines visible only to members of certain groups. The feature is aimed at students working in the same class, companies sharing press coverage, and other groups that might want an easy way to share Web pages with each other without having to use public tools like Facebook or Twitter. [Source: Flipboard]

T-Mobile has tasked its customers with creating a real-world coverage map that makes it easier to tell where its service works and where it doesn’t. Instead of guessing at where its customers will get service — which is what other carriers do, the company claims — it’s asking people to verify its predictions so it can be more honest with consumers. [Source: T-Mobile]